i3 y axis to threaded leadscrew with radial bearings 'nut'

This is work in progress, i'll upload sources when i'll finish and when i'll have time
as it's pretty complicated array of openscad scripts included together :)
perhaps i will just zip whole folder...

this project is an attempt to convert Y axis of my large i3 (1m in Y dimension)
to leadscrew.
Obtaining strong enough belt was expensive so i've decided to give leadscrew a go.

I was inspired by threadless ballscrew designs, but i wanted to use threaded screw,
so i've modified the be